{"product_id":"suburban-525035-furnace-limit-switch-sf-42-sf-42f-sdh-2542","title":"Suburban 525035 Furnace Limit Switch – SF-42 \/ SF-42F \/ SDH-2542","description":"\u003ch3 data-section-id=\"nc3bgr\" data-start=\"110\" data-end=\"135\"\u003eProduct Description\u003c\/h3\u003e\n\u003cp data-start=\"136\" data-end=\"435\"\u003eThe \u003cstrong data-start=\"140\" data-end=\"180\"\u003eSuburban 525035 Furnace Limit Switch\u003c\/strong\u003e is a critical safety component designed to regulate internal furnace temperature and prevent overheating. This single limit switch opens at \u003cstrong data-start=\"321\" data-end=\"330\"\u003e195°F\u003c\/strong\u003e and resets at \u003cstrong data-start=\"345\" data-end=\"354\"\u003e155°F\u003c\/strong\u003e, helping protect your RV furnace from damage while maintaining proper operation.\u003c\/p\u003e\n\u003cp data-start=\"437\" data-end=\"729\"\u003eDesigned as an OEM replacement, this switch fits select \u003cstrong data-start=\"493\" data-end=\"542\"\u003eSuburban SF-42, SF-42F, and SDH-2542 furnaces\u003c\/strong\u003e. A failed limit switch can cause your furnace to shut down prematurely, cycle repeatedly, or fail to produce consistent heat—making this a key replacement part for restoring performance.\u003c\/p\u003e\n\u003chr data-start=\"731\" data-end=\"734\"\u003e\n\u003ch3 data-section-id=\"1v7iqwk\" data-start=\"736\" data-end=\"765\"\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul data-start=\"766\" data-end=\"962\"\u003e\n\u003cli data-section-id=\"4cx4s1\" data-start=\"766\" data-end=\"795\"\u003eOEM Suburban Part #525035\u003c\/li\u003e\n\u003cli data-section-id=\"1qplka\" data-start=\"796\" data-end=\"831\"\u003eOpens at 195°F, closes at 155°F\u003c\/li\u003e\n\u003cli data-section-id=\"vz2p1g\" data-start=\"832\" data-end=\"876\"\u003ePrevents overheating and internal damage\u003c\/li\u003e\n\u003cli data-section-id=\"1c79la2\" data-start=\"877\" data-end=\"926\"\u003eRestores proper furnace cycling and operation\u003c\/li\u003e\n\u003cli data-section-id=\"10xru0\" data-start=\"927\" data-end=\"962\"\u003eDurable, direct-fit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"964\" data-end=\"967\"\u003e\n\u003ch3 data-section-id=\"rkevhk\" data-start=\"969\" data-end=\"988\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp data-start=\"989\" data-end=\"1034\"\u003eFits the following Suburban furnace models:\u003c\/p\u003e\n\u003cul data-start=\"1035\" data-end=\"1174\"\u003e\n\u003cli data-section-id=\"1b27f6e\" data-start=\"1035\" data-end=\"1044\"\u003eSF-42\u003c\/li\u003e\n\u003cli data-section-id=\"10ne70f\" data-start=\"1045\" data-end=\"1161\"\u003eSF-42F\n\u003cul data-start=\"1058\" data-end=\"1161\"\u003e\n\u003cli data-section-id=\"16fx532\" data-start=\"1058\" data-end=\"1108\"\u003eApplies to units below serial number 921403896\u003c\/li\u003e\n\u003cli data-section-id=\"t7uhf5\" data-start=\"1111\" data-end=\"1161\"\u003eApplies to units above serial number 921403895\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"897wmz\" data-start=\"1162\" data-end=\"1174\"\u003eSDH-2542\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1176\" data-end=\"1230\"\u003eAlways verify model and serial number before ordering.\u003c\/p\u003e\n\u003chr data-start=\"1232\" data-end=\"1235\"\u003e\n\u003ch3 data-section-id=\"12a2vhf\" data-start=\"1237\" data-end=\"1274\"\u003eCommon Problems This Part Fixes\u003c\/h3\u003e\n\u003cul data-start=\"1275\" data-end=\"1427\"\u003e\n\u003cli data-section-id=\"f0ukxu\" data-start=\"1275\" data-end=\"1308\"\u003eFurnace shuts off too quickly\u003c\/li\u003e\n\u003cli data-section-id=\"13sr24d\" data-start=\"1309\" data-end=\"1352\"\u003eFurnace overheats or trips safety limit\u003c\/li\u003e\n\u003cli data-section-id=\"1tsvqsx\" data-start=\"1353\" data-end=\"1392\"\u003eBurner cycles on and off repeatedly\u003c\/li\u003e\n\u003cli data-section-id=\"18tmuok\" data-start=\"1393\" data-end=\"1427\"\u003eInconsistent or no heat output\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1429\" data-end=\"1432\"\u003e\n\u003ch3 data-section-id=\"17tjqny\" data-start=\"1434\" data-end=\"1455\"\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul data-start=\"1456\" data-end=\"1507\"\u003e\n\u003cli data-section-id=\"14qep2e\" data-start=\"1456\" data-end=\"1507\"\u003e(1) Suburban 525035 Furnace Limit Switch (Single)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1509\" data-end=\"1512\"\u003e\n\u003ch3 data-section-id=\"1d7m6hl\" data-start=\"1514\" data-end=\"1538\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul data-start=\"1539\" data-end=\"1733\"\u003e\n\u003cli data-section-id=\"bs9wk2\" data-start=\"1539\" data-end=\"1579\"\u003eDisconnect power before installation\u003c\/li\u003e\n\u003cli data-section-id=\"1fdb60k\" data-start=\"1580\" data-end=\"1644\"\u003eReplace in the same mounting position as the original switch\u003c\/li\u003e\n\u003cli data-section-id=\"oqjbks\" data-start=\"1645\" data-end=\"1681\"\u003eVerify proper wiring connections\u003c\/li\u003e\n\u003cli data-section-id=\"1d61l67\" data-start=\"1682\" data-end=\"1733\"\u003eProfessional installation recommended if unsure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1810\" data-end=\"1813\"\u003e\n\u003ch3 data-section-id=\"c4a8sj\" data-start=\"1815\" data-end=\"1825\"\u003eFAQs\u003c\/h3\u003e\n\u003cp data-start=\"1827\" data-end=\"1964\"\u003e\u003cstrong data-start=\"1827\" data-end=\"1867\"\u003eWhat does a furnace limit switch do?\u003c\/strong\u003e\u003cbr data-start=\"1867\" data-end=\"1870\"\u003eIt monitors internal temperature and shuts the furnace down if it overheats to prevent damage.\u003c\/p\u003e\n\u003cp data-start=\"1966\" data-end=\"2093\"\u003e\u003cstrong data-start=\"1966\" data-end=\"2010\"\u003eHow do I know if my limit switch is bad?\u003c\/strong\u003e\u003cbr data-start=\"2010\" data-end=\"2013\"\u003eCommon signs include short cycling, overheating shutdowns, or inconsistent heat.\u003c\/p\u003e\n\u003cp data-start=\"2095\" data-end=\"2219\"\u003e\u003cstrong data-start=\"2095\" data-end=\"2142\"\u003eIs this compatible with all SF-42 furnaces?\u003c\/strong\u003e\u003cbr data-start=\"2142\" data-end=\"2145\"\u003eIt fits specific serial number ranges—confirm your unit before purchasing.\u003c\/p\u003e\n\u003cp data-start=\"2221\" data-end=\"2368\"\u003e\u003cstrong data-start=\"2221\" data-end=\"2251\"\u003eCan I install this myself?\u003c\/strong\u003e\u003cbr data-start=\"2251\" data-end=\"2254\"\u003eYes, if you are comfortable with basic electrical components; otherwise, professional installation is recommended.\u003c\/p\u003e","brand":"RV Furnace Guys","offers":[{"title":"Default Title","offer_id":48060001911025,"sku":null,"price":14.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4941\/0289\/files\/525035.webp?v=1776623740","url":"https:\/\/rvfurnaceguys.com\/products\/suburban-525035-furnace-limit-switch-sf-42-sf-42f-sdh-2542","provider":"RV Furnace Guys","version":"1.0","type":"link"}